How to downgrade in linux? How to roll back the latest update in linux? How to look at fastcgi where nginx is accessing, so for sure?

Question

linux

I updated Debain with all packages and now hhvm began to write 404
nginx config 1.2.1

fastcgi_keep_conn on;
    fastcgi_pass   127.0.0.1:4247;
    fastcgi_index  index.php;
    fastcgi_param  SCRIPT_FILENAME $dirq/cpc/$fastcgi_script_name;
    include        fastcgi_params;

hhvm 3.2 config

; php options

pid = /var/run/hhvm/pid

; hhvm specific

hhvm.server.port = 4247
hhvm.server.type = fastcgi
hhvm.server.default_document = index.php
hhvm.log.use_log_file = true
hhvm.log.file = /var/log/hhvm/error.log
hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc


; php options
; hhvm specific

hhvm.log.level = Warning
hhvm.log.always_log_unhandled_exceptions = true
hhvm.log.runtime_error_reporting_level = 8191
hhvm.repo.central.path = /var/run/hhvm/hhvm.hhbc
hhvm.mysql.typed_results = false

Everything was working before the update. But not now. I don't even know how to check where hhvm is addressing that it gives 404 ... In general, you need to roll back to hhvm 3.1 Or see where nginx is accessing via fastcgi. to draw conclusions. access log doesn't work either...

Answer 1

Look what and where:
Or
To taste.
You can also strace, look at system calls. -

ps -ef | grep hhvm | awk '{ print "-p " $2}' | xargs strace -v -s 1000000